A stroke is a medical emergency in which blood supply to part of the brain is interrupted or reduced. Brain tissue is deprived of oxygen and food and brain cells begin to die.
Concussion is an injury occurring when the brain is forced to suddenly slide back and forth against the inner skull. Every concussion, even when mild, causes brain injury. Headache, balance and coordination problems, and diminished concentration and memory can result. Bleeding in or around your brain may also result, which can in some cases be fatal.
Balance is controlled by the visual, vestibular and proprioceptive systems, which work together. If one of these systems is impaired, poor balance can result, creating a much greater risk of a fall.